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Finding the Fourth Proportional to 290.12, 434.79 and 221.43

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Solution

The fourth proportional to 290.12, 434.79 and 221.43 is: 331.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.12 : 434.79 = 221.43 : x
  2. Step 2: Convert to fraction form
    290.12/434.79 = 221.43/x
  3. Step 3: Cross multiply
    290.12x = 434.79 × 221.43
  4. Step 4: Simplify right side
    290.12x = 96,275.55
  5. Step 5: Solve for x
    x = 96,275.55/290.12
  6. Step 6: Final answer
    x = 331.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.